Correspondence and papers from the 'A' file series (POWE 26/1-491) and Statutory Rules and Orders from the A5000 series of the Mines Department of the Board of Trade and its successor departments in the Ministry of Fuel and Power and later the Ministry of Power (POWE 26/492-1718)

Until 1920 they are records of various departments of the Board of Trade, then of the Mines Department until 1942, and subsequently of the Ministry of Fuel and Power. The series also includes some records of the International Labour Organization's Coal Mines Committee.